[PATCH 21/21] e1000: Expose i210's iNVM as a cdev
Andrey Smirnov
andrew.smirnov at gmail.com
Tue May 31 10:09:40 PDT 2016
Add code needed to expose iNVM memory on the chip as a cdev. The
driver also registers a dummy "invm" device that exposes "locked"
property which is used to implement iNMV line locking feature.
Signed-off-by: Andrey Smirnov <andrew.smirnov at gmail.com>
---
drivers/net/e1000/e1000.h | 35 +++++
drivers/net/e1000/eeprom.c | 312 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 347 insertions(+)
diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index 73f2b98..b45a364 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -1973,6 +1973,11 @@ struct e1000_eeprom_info {
#define ICH_FLASH_LINEAR_ADDR_MASK 0x00FFFFFF
#define E1000_SW_FW_SYNC 0x05B5C /* Software-Firmware Synchronization - RW */
+#define E1000_PCIEMISC 0x05BB8
+#define E1000_PCIEMISC_DMA_IDLE (1 << 9)
+#define E1000_PCIEMISC_RESERVED_MASK (~(E1000_PCIEMISC_DMA_IDLE))
+#define E1000_PCIEMISC_RESERVED_PATTERN1 0x8A
+#define E1000_PCIEMISC_RESERVED_PATTERN2 (0x122 << 10)
/* SPI EEPROM Status Register */
#define EEPROM_STATUS_RDY_SPI 0x01
@@ -2087,6 +2092,29 @@ struct e1000_eeprom_info {
after IMS clear */
+
+#define E1000_INVM_TEST(n) (0x122A0 + 4 * (n))
+#define E1000_INVM_DATA_(n) (0x12120 + 4 * (n))
+#if 0
+#define E1000_INVM_DATA(n) E1000_INVM_TEST(n)
+#else
+#define E1000_INVM_DATA(n) E1000_INVM_DATA_(n)
+#endif
+
+#define E1000_INVM_LOCK(n) (0x12220 + 4 * (n))
+#define E1000_INVM_LOCK_BIT (1 << 0)
+
+#define E1000_INVM_PROTECT 0x12324
+#define E1000_INVM_PROTECT_CODE (0xABACADA << 4)
+#define E1000_INVM_PROTECT_BUSY (1 << 2)
+#define E1000_INVM_PROTECT_WRITE_ERROR (1 << 1)
+#define E1000_INVM_PROTECT_ALLOW_WRITE (1 << 0)
+
+#define E1000_INVM_DATA_MAX_N 63
+
+#define E1000_EEMNGCTL_CFG_DONE (1 << 18)
+
+
struct e1000_hw {
struct eth_device edev;
@@ -2101,6 +2129,13 @@ struct e1000_hw {
e1000_media_type media_type;
e1000_fc_type fc;
struct e1000_eeprom_info eeprom;
+
+ struct {
+ struct cdev cdev;
+ struct device_d dev;
+ int line;
+ } invm;
+
uint32_t phy_id;
uint32_t phy_revision;
uint32_t original_fc;
diff --git a/drivers/net/e1000/eeprom.c b/drivers/net/e1000/eeprom.c
index 9032c12..55ccf37 100644
--- a/drivers/net/e1000/eeprom.c
+++ b/drivers/net/e1000/eeprom.c
@@ -773,3 +773,315 @@ int e1000_validate_eeprom_checksum(struct e1000_hw *hw)
return -E1000_ERR_EEPROM;
}
+
+static ssize_t e1000_invm_cdev_read(struct cdev *cdev, void *buf,
+ size_t count, loff_t offset, unsigned long flags)
+{
+ uint8_t n, bnr;
+ uint32_t line;
+ size_t chunk, residue = count;
+ struct e1000_hw *hw = container_of(cdev, struct e1000_hw, invm.cdev);
+
+ n = offset / sizeof(line);
+ if (n > E1000_INVM_DATA_MAX_N)
+ return -EINVAL;
+
+ bnr = offset % sizeof(line);
+ if (bnr) {
+ /*
+ * if bnr in not zero it means we have a non 4-byte
+ * aligned start and need to do a partial read
+ */
+ const uint8_t *bptr;
+
+ bptr = (uint8_t *)&line + bnr;
+ chunk = min(bnr - sizeof(line), count);
+ line = e1000_read_reg(hw, E1000_INVM_DATA(n));
+ line = cpu_to_le32(line); /* to account for readl */
+ memcpy(buf, bptr, chunk);
+
+ goto start_adjusted;
+ }
+
+ do {
+ if (n > E1000_INVM_DATA_MAX_N)
+ return -EINVAL;
+
+ chunk = min(sizeof(line), residue);
+ line = e1000_read_reg(hw, E1000_INVM_DATA(n));
+ line = cpu_to_le32(line); /* to account for readl */
+
+ /*
+ * by using memcpy in conjunction with min should get
+ * dangling tail reads as well as aligned reads
+ */
+ memcpy(buf, &line, chunk);
+
+ start_adjusted:
+ residue -= chunk;
+ buf += chunk;
+ n++;
+ } while (residue);
+
+ return count;
+}
+
+static int e1000_invm_program(struct e1000_hw *hw, u32 offset, u32 value,
+ unsigned int delay)
+{
+ int retries = 400;
+ do {
+ if ((e1000_read_reg(hw, offset) & value) == value)
+ return E1000_SUCCESS;
+
+ e1000_write_reg(hw, offset, value);
+
+ if (delay) {
+ udelay(delay);
+ } else {
+ int ret;
+
+ if (e1000_read_reg(hw, E1000_INVM_PROTECT) &
+ E1000_INVM_PROTECT_WRITE_ERROR) {
+ dev_err(hw->dev, "Error while writing to %x\n", offset);
+ return -EIO;
+ }
+
+ ret = e1000_poll_reg(hw, E1000_INVM_PROTECT,
+ E1000_INVM_PROTECT_BUSY,
+ 0, SECOND);
+ if (ret < 0) {
+ dev_err(hw->dev,
+ "Timeout while waiting for INVM_PROTECT.BUSY\n");
+ return ret;
+ }
+ }
+ } while (retries--);
+
+ return -ETIMEDOUT;
+}
+
+static int e1000_invm_set_lock(struct param_d *param, void *priv)
+{
+ struct e1000_hw *hw = priv;
+
+ if (hw->invm.line > 31)
+ return -EINVAL;
+
+ return e1000_invm_program(hw,
+ E1000_INVM_LOCK(hw->invm.line),
+ E1000_INVM_LOCK_BIT,
+ 10);
+}
+
+static int e1000_invm_unlock(struct e1000_hw *hw)
+{
+ e1000_write_reg(hw, E1000_INVM_PROTECT, E1000_INVM_PROTECT_CODE);
+ /*
+ * If we were successful at unlocking iNVM for programming we
+ * should see ALLOW_WRITE bit toggle to 1
+ */
+ if (!(e1000_read_reg(hw, E1000_INVM_PROTECT) &
+ E1000_INVM_PROTECT_ALLOW_WRITE))
+ return -EIO;
+ else
+ return E1000_SUCCESS;
+}
+
+static void e1000_invm_lock(struct e1000_hw *hw)
+{
+ e1000_write_reg(hw, E1000_INVM_PROTECT, 0);
+}
+
+static int e1000_invm_write_prepare(struct e1000_hw *hw)
+{
+ int ret;
+ /*
+ * This needs to be done accorging to the datasheet p. 541 and
+ * p. 79
+ */
+ e1000_write_reg(hw, E1000_PCIEMISC,
+ E1000_PCIEMISC_RESERVED_PATTERN1 |
+ E1000_PCIEMISC_DMA_IDLE |
+ E1000_PCIEMISC_RESERVED_PATTERN2);
+
+ /*
+ * Needed for programming iNVM on devices with Flash with valid
+ * contents attached
+ */
+ ret = e1000_poll_reg(hw, E1000_EEMNGCTL,
+ E1000_EEMNGCTL_CFG_DONE,
+ E1000_EEMNGCTL_CFG_DONE, SECOND);
+ if (ret < 0) {
+ dev_err(hw->dev,
+ "Timeout while waiting for EEMNGCTL.CFG_DONE\n");
+ return ret;
+ }
+
+ udelay(15);
+
+ return E1000_SUCCESS;
+}
+
+static ssize_t e1000_invm_cdev_write(struct cdev *cdev, const void *buf,
+ size_t count, loff_t offset, unsigned long flags)
+{
+ int ret;
+ uint8_t n, bnr;
+ uint32_t line;
+ size_t chunk, residue = count;
+ struct e1000_hw *hw = container_of(cdev, struct e1000_hw, invm.cdev);
+
+ ret = e1000_invm_write_prepare(hw);
+ if (ret < 0)
+ return ret;
+
+ ret = e1000_invm_unlock(hw);
+ if (ret < 0)
+ goto exit;
+
+ n = offset / sizeof(line);
+ if (n > E1000_INVM_DATA_MAX_N) {
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ bnr = offset % sizeof(line);
+ if (bnr) {
+ uint8_t *bptr;
+ /*
+ * if bnr in not zero it means we have a non 4-byte
+ * aligned start and need to do a read-modify-write
+ * sequence
+ */
+
+ /* Read */
+ line = e1000_read_reg(hw, E1000_INVM_DATA(n));
+
+ /* Modify */
+ /*
+ * We need to ensure that line is LE32 in order for
+ * memcpy to copy byte from least significant to most
+ * significant, since that's how i210 will write the
+ * 32-bit word out to OTP
+ */
+ line = cpu_to_le32(line);
+ bptr = (uint8_t *)&line + bnr;
+ chunk = min(sizeof(line) - bnr, count);
+ memcpy(bptr, buf, chunk);
+ line = le32_to_cpu(line);
+
+ /* Jumping inside of the loop to take care of the
+ * Write */
+ goto start_adjusted;
+ }
+
+ do {
+ if (n > E1000_INVM_DATA_MAX_N) {
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ chunk = min(sizeof(line), residue);
+ if (chunk != sizeof(line)) {
+ /*
+ * If chunk is smaller that sizeof(line), which
+ * should be 4 bytes, we have a "dangling"
+ * chunk and we should read the unchanged
+ * portion of the 4-byte word from iNVM and do
+ * a read-modify-write sequence
+ */
+ line = e1000_read_reg(hw, E1000_INVM_DATA(n));
+ }
+
+ line = cpu_to_le32(line);
+ memcpy(&line, buf, chunk);
+ line = le32_to_cpu(line);
+
+ start_adjusted:
+ /*
+ * iNVM is organized in 32 64-bit lines and each of
+ * those lines can be locked to prevent any further
+ * modification, so for every i-th 32-bit word we need
+ * to check INVM_LINE[i/2] register to see if that word
+ * can be modified
+ */
+ if (e1000_read_reg(hw, E1000_INVM_LOCK(n / 2)) &
+ E1000_INVM_LOCK_BIT) {
+ dev_err(hw->dev, "line %d is locked\n", n / 2);
+ ret = -EIO;
+ goto exit;
+ }
+
+ ret = e1000_invm_program(hw,
+ E1000_INVM_DATA(n),
+ line,
+ 0);
+ if (ret < 0)
+ goto exit;
+
+ residue -= chunk;
+ buf += chunk;
+ n++;
+ } while (residue);
+
+ ret = E1000_SUCCESS;
+exit:
+ e1000_invm_lock(hw);
+ return ret;
+}
+
+static struct file_operations e1000_invm_ops = {
+ .read = e1000_invm_cdev_read,
+ .write = e1000_invm_cdev_write,
+ .lseek = dev_lseek_default,
+};
+
+int e1000_register_eeprom(struct e1000_hw *hw)
+{
+ int ret = E1000_SUCCESS;
+ u16 word;
+ struct param_d *p;
+
+ struct e1000_eeprom_info *eeprom = &hw->eeprom;
+
+ switch (eeprom->type) {
+ case e1000_eeprom_invm:
+ ret = e1000_read_eeprom(hw, 0x0A, 1, &word);
+ if (ret < 0)
+ return ret;
+
+ if (word & (1 << 15))
+ dev_warn(hw->dev, "iNVM lockout mechanism is active\n");
+
+ hw->invm.cdev.dev = hw->dev;
+ hw->invm.cdev.ops = &e1000_invm_ops;
+ hw->invm.cdev.priv = hw;
+ hw->invm.cdev.name = xasprintf("e1000-invm%d", hw->dev->id);
+ hw->invm.cdev.size = 32 * E1000_INVM_DATA_MAX_N;
+
+ ret = devfs_create(&hw->invm.cdev);
+ if (ret < 0)
+ break;
+
+ strcpy(hw->invm.dev.name, "invm");
+ hw->invm.dev.parent = hw->dev;
+ ret = register_device(&hw->invm.dev);
+ if (ret < 0) {
+ devfs_remove(&hw->invm.cdev);
+ break;
+ }
+
+ p = dev_add_param_int(&hw->invm.dev, "lock", e1000_invm_set_lock,
+ NULL, &hw->invm.line, "%u", hw);
+ if (IS_ERR(p)) {
+ unregister_device(&hw->invm.dev);
+ devfs_remove(&hw->invm.cdev);
+ break;
+ }
+
+ break;
+ }
+
+ return ret;
+}
--
2.5.5
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